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Patented Nov. 8, |898. C. BUND. GAS HEATED FURNACE.

(Application tiled May 21, 1.898.)`

3 Sheets-Sheet I.

(N0 Model.)

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E WI l GHHRLES BON msllTromeYs No. 613,96I. Patented Nov. 8, |898.

C. BOND.

GAS HEATED FURNACE.

(Application led May 21, 1898.) (N0 Model.) 3 Sheets-$heet 2.

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m: Norms PETERS co. r-Nomumo.. -Msnmomm n c Patented Nov. a, |898.

c.y Bonn. GAS HEATED FURNACE.

leauay 21, 189s.)

(Applcation '3 sheets-mwst a.

(No'ModeL) IANv ENTOR CHARLES Bom? Jwim LM/m4 HIS HTTORNEYS- UNITED STATES PATENT OFFICE.

CHARLES BOND, OF WHIFFLT, SCOTLAND;

GAS-HEATED FURNACE.

SPECIFICATION forming part of Letters Patent No. 613,961, dated November 8, 189s. imitation ned May 21, 189s. serai No. 681,373. (ne medei.)

To all whom it may concern:

Be it known that I, CHARLES BOND, bricklayer, a subject of the Queen of Great Britain and Ireland, and a resident of Whifliet, county of Lanark, Scotland, have invented certain new and useful Improvements in Gas- Heated Furnaces, of which the following is a specification.

My invention relates to improvements in gas-heated furnaces of the class in which the gas to be burned within the furnace is provided by a gas-producer, and has for its objects the utilization of the gas-producer as a steam-generator and by the arrangement of the gas and air passages the obtainment of the maximum of heat and the total consumption of smoke, while using the waste products of combustion to raise steam in an ordinary boiler, and also to effect economy in construction and increased durability.

The drawings yillustrate the application of my invention to a duplex heating-furnace, one half of which only is shown, the other half being merely a duplication of the same in all its details, although my invention is equally applicable to a single arrangement of furnace.

Figure 1 is a longitudinal and vertical seotion of one half of a duplex heating-furnace. Fig. 2 is an end view, partly in section. Fig. 3 is a transverse section on the line 1 1. Fig. 4 is a horizontal view, partly in section, on the line 2 2. Fig. 5 is a horizontal section on the line 3 3, and Fig. 6 is a horizontal section on the line 4 4.

The gas-producer A is erected near the end of the furnace, at one side thereof, and is duplicated at the other end in the case of a duplex furnace. This producer is preferably in the form of a steam-boiler having inner and outer shells forming an internal combustionchalnberand an annular water-space provided with a closed ash-pit A over a water-tank,

into which ash-pit compressed air from any fan, blower, or other source of supply is introduced by the nozzles A2.l The grate A3 supports the incandescent fuel, and fresh fuel is fed into the interior from the hopper A4 through the duplex sliding doors A5, beneath which the cone A.6 is fitted to spread the fuel as it falls, or the cone may be suspended from the end of a lever actuated from outside to act as the lower closing door or valve. Tubular openings A7 are formed through the shells and water-space of the boiler for the introduction of bars for stirring up the fuel within, and these openings can be closed by covers or plugs. Tubes A8 are also provided, closed with blind flanges, to give access to the interior, when desired, or they may be used for coupling one gas-producer to another where more than one are used. The boiler would be further provided with a manholedoor A9, as shown in Fig. 2, water-injecting apparatus, a safety-valve, and other fittings, which it is unnecessary to show in the drawings. The upper part of the boiler is formed with an annular steam-drum which is lined with refractory material, as shown in Fig. 1.

The gas generated in the producer passes through the short pipe B into gas-holding chambers B', one on each side, which are connected by the arched passage B2, and through ports B3 (shown in Fig. 2) and opened and closed by the suspended valves B4 in Fig. 1, whence it passes by the duct B5 to be consumed within the furnace O.

A chamber is formed below the hearth C', which is divided into two parts by the partition-wall C2 and provided with the baffles O3, and the air for admiXture with the gas .to be consumed enters or is forced in by the openings C4 and on its Way to the furnace circulates around the baflies to be heated. From this heating-chamber the air passes through inclined gridiron valves D, actuated from the outside by the bars D', secured to them, up the passages E, Fig. 6, E, Fig. 5, filled with checker brickwork, whence it passes by an interior duct to the heating-chamber E2, Fig. 4, filled with walls or checkers of brickwork, from which it passes through top openings by the passage E3, Fig. 1, to the furnace O,where it mixes with the gas to consume it. A partition-wall F divides the heating-chamber of one half of the furnace from that of the other half, the said furnace being provided with suitable side doors J.

G is an upright boiler,which may be of any ordinary construction, or it maybe a boiler of any other type suitable,which is heated by the waste products of combustion and, like the gasproducer, is duplicated at the other end of the furnace in the case of aduplex furnace;

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but in the case of a single furnace this boiler and its smoke-consu ming appliance are placed at the other end of the furnace. This boiler may, if desired, be connected to the producerboiler to equalize the steam-pressure and is preferably provided with a supplementary producer II. The space Il' below the producer is filled with checker briclwork (not shown in Fig. 1, but indicated in Figs. 5 and 6) to heat the air passing to the producer H and space G.

In operating the duplex furnace the pro'- ducer-gas and air are introduced to the furnace C from each end alternately by opening and closing the valves B4 and D, the products of combustion passing through the whole length of the furnace and passing down the passage B5, through the opening BG (indicated in dotted lines) to the interior of the chamber G. \Vithin this chamber G it is mixed with producer-gas from a small producer, (indicated at H,) and the gas and products of combustion becoming thoroughly mixed by passing through the openings in the brickwork or fire-clay cylinder I pass under the boiler G, where they are burned, the gas and air currents being reversed intermittently. In the case of a melting-furnace this duplex process is very advantageous.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a gas-heated furnace, the combination with the furnace, of a gas-producer having its combustion-chamber surrounded by a waterchamber to form a steam-generator, gas-holding chambers and passages connecting said chambers with the producer and with the furnace, air-heating chambers below the hearth of said furnace, and passages connecting said air-heating chambers with the furnace, and a steam-boiler provided with smoke-consuming devices connected by passages with the furnace, substantially as described.

2. In combination with a gas-heated furnace, a gas-producer having an inner shell forming a combustion-chamber, passages connecting the same to said furnace, an outer shell forming a water-chamber, the upper part of which constitutes an annular steam-drum, and a lining of refractory material on the inner wall of said drum, with suitable passages connecting the gas-prod ucer with the furnace, substantially as described.

3. The combination with a gas-heated furnace provided with gas-holding chambers near one end communicating with the furnacechamber, air-heating chambers below the hearth of said f urnace-chamber and a passage connecting said air-heating chamber with the furnace above the hearth, a gas-producer having passages connecting the combustionchamber thereof with the gas-holding chambers of the furnace, and a supplementary steam-boiler having a gas-combustion chamber and communicating with the furnace, substantially as described.

4. The combination with a gas-heated furnace, provided with gas-holding chambers near one end and a passage connecting said chambers with the furnace-chamber, aireheating chamber below the hearth of said furnacechamber, and a passage connecting said airheating chamber with the furnace above the hearth, a gas-producer communicating with the gas-holding chambers, a supplementary steam-boiler having a combustion-chamber, a producer in said chamber, and passages for conveying unconsumed smoke from the furnace to said combustion-chamber, substantially as described.

5. The combination with a gas-heated furnace, provided with gas-holding chambers near one end and communicating with the furnace above the hearth thereof, air-heating chambers below said hearth and communicating with the furnace above the hearth, a gas-producer having passages connecting the combustion-chamber thereof with the gasholding chambers, and valves controlling the passages leading from the air-heating chambers to the furnace, and valves also controlling the passages leading from the gas-producer to said gas-holding chambers.

G. The combination with a gas-heated furnace, provided with gas-holding chambers near one end comm unicating with the furnace, of a gas-producer formed of inner and outer shells, an annular steam-drum formed at the upper end of the producer, a refractory lining on the inside of said drum, a feed-hopper carried by said refractory lining and passages connecting said producer with the gas-holding chambers, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CIIAS. BOND.

lVitnesses:

R. C. THOMSON, WM. RUTHERFORD.

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